Typewriting machine



Dec. 8, 1942. R. w. PITMAN TYPEWRITINQ MACHINE Filed Oct. 18, 1940 4 Sheets-Sheet l 4 Sheets-Sheet 2 R. W. PITMAN TYPEWRITING MACHINE Filed Oct.

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Dec. 8, 1942.

ATTORNEY Dec. 8, 1942. R. w, PITMAN TYPEWRITING MACHINE Filed Oct. 18, 1940 4ASheeQS-Sheekl 3 S m NQ, uw? kkw 4 m Q m i lf l MS SQ Q VKQ S v \N\ n 'wlillll IIHHIIhlV/l IIIIIIIHHHHHHUUIMHIIIIHHHINIIIIIIIJ. lllllllll NMR!! ad @qc Y ATTORNEY Dec. 8, 1942- R. w. PITMAN 2,304,277

TYPEWRITING MACHINE Filed Oct. 18, 1940 4 Sheets-Sheet 4 BY v ATTORNEY Patented Dee. 8, 1942 TYPEWRITING MACHINE mchard W. Pitman, West Hartford, Conn., as-

signor to Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application October 18, 1940, Serial No. 361,673

16 Claims.

This invention deals with work-sheet-positionv ing devices in a typing machine, accounting machine or the like.

A work sheet may be removed from the machine after the latter has been operated to record an entry thereon; subsequently the Work sheet is to be accurately replaceable in the machine in an advanced position in order to record a. further entry. In this way, numerous entries are progressively recorded on the work sheet fromtime to time and are disposed at line-spaced intervals on the work sheet.

At each entry, the sheet is marked by suitable means in the machine with an index settable to a gaging device for relocating the sheet in an advanced position.

The machine may have a laterally movable carriage in order to extend the recorded line on the work sheet. AA line-spacing mechanism is also provided and is usually operable coincidentally with returning the carriage.

The machine may also have means, operative in recording a new entry, to sense a record represented by perforations included in the preceding entry. It is necessary therefore to accurately relocate the sheet in its advanced position for each new entry so that the perforated record will be in accurate registry with the sensing means.

The general object of the invention is to provide a device for gaging the replacement of a work sheet in the machine and to adapt such device so that it serves accurately to locate the sheet, is simple in structure, and durable and conduces to time-and-labor-saving in the operations of removing and replacing the work sheet.

In o rder that the operation of the line spacing mechanism may not cause the sheetto become jammed and damaged by the gaging devices, it is a further object of the invention to provide means whereby the operation of the line spacer will automatically prevent interference of the gaging device with line space movement of the work sheet A further object is to provide an element which may be manipulated at will, independently of a line-spacing operation, to prevent obstruction by the gaging device of a shift of the work sheet.

Another object is to adapt the gaging device so that a simple and readily executed manner of manipulating the sheet itself will serve to engage the sheet with and disengage it from said gaging devices.

' object of the invention is to provide a device v The machine herein shown has a revoluble 55 platen or feed roller for the work sheet. It is a further object of the invention to provide means affording a passage for directing front-insertion of the work sheet to the platen or feed roller and to have said passage means conditionable for facilitating rear insertion of the work sheet.

It is a further object to adapt the gaging devices so that it suiices to present only one side or margin of the sheet thereto as distinguished from gaging the sheet at both sides or margins.

The machine has printing or recording mechanism which may operate automatically under the control of the "work sheet perforations and sensing means for recording at least apart of each new entry on the work sheet. A further responsive to the absence of a work sheet in the machine for suppressing such effectivity of the sensing means.

The foregoing and other objects, features and advantages of the invention will be apparent from the following description of a preferred embodiment.

In the accompanying drawings:

Figure 1 is a cross sectional side view of the carriage mechanism including the sheet insertion and locating structure.

Figure 2 is an enlarged scale cross sectional View of a detail of the sheet insertion structure.

Figure 3 is a'perspective of the sheetlocating pin structure and means for controlling projection and retraction of the pin.

Figure 4 is a large scale cross-sectional view, taken on the trace 4-4 of Figure 10, of mounting and operating means for the sheet locating pin.

Figure 5 is a top plan view of a sheet edge stop device including a switch for controlling an operating circuit of the machine.

Figure 6 is a side view, partly sectioned, of a feed roll and apron device associated with the platen.

Figure '7 is a front view of the carriage and I its front-insertion and locating means for the work sheet and shows the latter in place.-

Figure 8 is a cross sectional side view of the carriage showing the sheet insertion throat conditioned to direct the leading edge of a rearinserted sheet.

Figure 9 is a perspective of details of a. mounting for the sheet locating pin. I

Figure 10 is a top plan view of the carriage showing parts of thev sheet locating means in their normal positions.

` sembly of sheet locating structure, line space mechanism, and other parts of the carriage.

Figure 15 is a perspective, from the rear of the carriage, illustrating details of the line spaceand carriage return structure.

A main frame F, partly shown, of a-typewriter mounts front and rear tracks I5, I6 for the paper carriage I1. Type bars I8 are swingable toward a common type-guide I9 on a type-bar fulcrumlng segment 20. The type bars print on a work sheet 2I backed by a revoluble platen 22 whose axle 23 is journaled in left and right side members or plates 24 of a, frame which may be case shiftable relatively to and mounted in a main frame 26 of the carriage.

A feed rack 21 on carriage frame 26 engages a pinion 28 having an escapement wheel 29 controlled .by escapement dogs 30 that cooperate with type bars I8 through a universal bar 3| to letter feed the carriage. The usual spring motor 32 drives the carriage in letter feeding direction.

A rack 33 on carriage frame 26 meshes with a carriage-return pinion 34 movable along a power shaft 35 journaled on the main f rame F and driven by an electric motor, not shown. A shifter 36 is operable either under control of a manually operable carriage return key, not shown, or automatically under control of means, not shown, actuated by the carriage at a line-end to move pinion 34 toward the rear of the machine into clutching engagement with a clutch collar 31 ilxed to shaft`35. The resulting rotation of pinion 34 at first moves rack 33 endwise a limited extent in carriage-return direction relatively to the carriage; then the carriage is moved in return direction by the continued=piniondriven rack movement.

The power-driven carriage return movement is terminated by encounter of a tappet 38 on carriage frame 26 with a cam arm 39 on a rock shaft 46 to rock the latter counterclockwise of Figure 1 to operate shifter 36 to unclutch pinion 34 from collar 31. For this purpose, rock shaft 40, which is journaled in frame F, has an operative connection,diagrammatically represented by the dot-and-dash line 4I, Figure 1, to shifter 36. Cam-arm 39 may be splined to rock shaft 40 for adjustment along the latter to different line-start` stations and may be associated with a laterally adjustable line-start margin stop, not shown.

As will appear later, rack 33 returns leftwardly endwise to its original position relatively to the carriage, when pinion 34 becomes unclutched from power shaft'35. Tongues attached to carriage frame at sxidably nt slots 45 in rack as. to support the latter, and the ends of said slots engage said tongues-to limit the described endwise movements of the rack relatively to the carriage.

Rack 33 includes line-spacer rack teeth 41, Figures 10, 13, 14, 15. A vertical rock shaft 48 is joumaled in structure 49 fixed to the main carriage frame 26. A pinion I! lmounted on said structure 49 connects rack teeth 41 to a gear sector 5| fixed to the lower end of shaft 46. A

pinion 52 fixed to the upper end of said shaft 48 meshes with a rack 53 slidably supported by said structure 49. The left side plate 24 of the case shiftable frame is adapted to support slidably a bar 54 to which-is pivoted a line spacer pawl 55 normally disengaged from but engageable with a line-space ratchet wheel 56 attached to platen axle 23. A lateral tab 51 of bar 54 is engageable by a spur 56 of rack 53.

The rightward movement of carriage return rack 33 relatively to the carriage frame 26 is translatedlby the parts 41, 48, 50--53 into a rearward stroke of the line-space-pawl carrying bar 54. At a suitable time in said stroke, depending on the number of line-space steps desired, paw1 55 becomes engaged with ratchet wheel 56 to rotate the latter and theplaten in line space direction. A tab 59, Figure 13, is variably positionable by means of a manually settable adjuster 60, partly shown, to control the pawl 55 and hence its time of engagement with the ratchet wheel 56 so as to determine one, two, or three steps of line-space rotation of the platen by said rearward stroke of bar 54. Bar 54 may be case shiftable with the platen but in either case position, its tab 51 may engage the rack spur 58.

The usual manual line-space lever and handle 6I is pivoted at 62 to the carriage frame 26 and serves Iin well-known manner for operating the line-space mechanism. and returning the carriage manually.

The supporting structure 49 of the line space mechanism on the carriage includes a bracket 63 attached to the carriage frame 26 by screws 64, Figure 15. One of the rack supporting tongues 44 may be incorporated in said bracket 63 to support rack 33 at one end while the rack is supported at its other end by a similar tongue incorporated in a suitable bracket, not shown, attached to carriage frame 26. The lower end of rock shaft 48 is ,journaled in bracket 63 which may also include a journaling stud 65 for pinion 50. The upper end of shaft 48 may be journaled in a block 66 attached to bracket 63 by screws 61. Rack 53 is'slidably retained by said block 66 and an overlying plate 68 removably secured to block 66 by screws 69.

A spring 10 is connected between the carriage side plate 24 and the line-space-pawl-bar 54 and serves to return the latter forwardly following a rearward line spacing stroke of said bar 54. 'I'he spring-return of bar 54 also serves to return the carriage-return rack 33 relatively to the carriage frame 26 if line-spacing has been eil'ected by means of said rack 33. The carriage return mechanism is along the lines of that shown in H. L. Pitman Patent No. 2,054,095, issued September l5, 1936 to which reference may be had for further details.

Feed rolls 12 cooperate with platen 22 to feed the work sheet. Feed-roll-supporting levers 13, Figure 6, are fulcrumed on a transverse rod 14 of the platen frame and are spring-pressed to press the feed rolls toward the platen. A transverse cam-shaft 16 in the platen frame is rockable in opposite directions to effect corresponding movements of levers 13 to disengage or reengage said feed rolls from or with the platen. A feed-roll-release lever 11 is fulcrumed at the right side of the platen frame and is connected by a link 18, partly shown in Figure 6, to cam shaft 16 for operating the latter for releasing or reengaging the feed rolls.

An inclined rear paper table includes a table is slidable onthe platen frame in the di-` rection, of its slope so that .the apron follows the movements of the feed rolls toward or from the platen. Therefore, when the feed rolls are moved to cast-oil? position, the apron lip 82 is also moved farther from the platen as indicated by the dotand-dash line in Figure 1 to facilitate front insertion of a work sheet. The feed roll and paper table mechanism may be substantially as shown in Helmond Patent No. 1,994,647, dated March 19, 1935.

In Figure 7, 2| designates a ledger sheet on which lines oi' entry are usually made one at a time in that the sheet is usually removed from the machine lafter a one-line entry has been made thereon and other sheets are successively inserted and replaced in the machine for receiving entries. Each entry includes an old balance amount and a debit" or credit amount computed against the old balance to give a new balance amount which is typed in the balance column and is recorded codally by letter-spaced perforations 85 made in the last column by means of suitable mechanism, not shown in detail herein but which may be provided in the machine and includes a group of punches 84. In the present instance, the line of perforations 85 is shown oi-set above the typing line of a corresponding entry.

For each last line of entry made on the sheet,

I the'latter is marked with an index preferably in the form of a single hole 86 placed near the right-hand edge of the sheet. A punch 81 is operable to punch the hole 86 and its location is preferably fixed in the machine relatively to sheet gaging devices so that each hole punched has a xed location on the sheet with reference to the corresponding line of entry.

In the present instance, each line of entry on the sheet is made at a distance of two line space units below the preceding line of entry. Correspondingly,'when a sheet is replacedin the machine for making a new entry, it is positioned by placing theV hole 86 for the last prior entry two line space units of distance above the location of the punch 81.

When a sheet is positioned in the machine by means of its last-made hole 86, the codal perforations 85 corresponding to the last-made previous line of entry will be in position to traverse and be sensed by means of a group of sensing pins 88 relatively to which the carriage and ledger sheet 2| are movable laterally during the sensing operation. vThere is a group of ve punches 84 and at a distance of two letter spaces above this group there is a group of five sensing pins 88. These groups are represented in Figure '7 by the solidly inked circles in distinction from the codal perforations 85.

The carriage is initially positioned for the old balance column so that said pins 88 sense those perforations that correspond to the highest order digit represented by the last-made line of perforations 85 on the sheet. In response to the sensing of the highest order digit, a type bar selecting and actuating circuit, including electromagnet mechanism, is controlled to cause the digit to be printed automatically by means of the appropriate numeral type bar I8. The resulting letter-feed step of the carriage and work sheet brings the perforations 85, representing the next higher digit, into sensing position relatively to the group of pins 88 so that said next higher perforations are sensed and thereby operation of a corresponding numeral type bar I8 iseiected.

And so the sensing and automatic typing proceed i digit by digit until the last vdigit represented by the perforated balance is sensed and is typed in the old balance column. Then the carriage is advanced for typing the entries in the debit and credit columns of the work sheet, and then is further advanced for typing the new balance and recording same by making corresponding perforations 8'5 by means of the punching mechanism which includes the group of punches 84. The corresponding new sheet locating hole 86 is, of course, made by operating the punch device 81 before the sheet is removed from the machine. The present invention is concerned principally with sheet positioning mechanism which will now be described. a

A transverse bar 80, preferably' of channel cross section, is secured by screwsf`8| to side plates 24 of the platen frame. A transverse plate 82, preferably of sheet metal, is of suitable length according to the width of work sheet 2| and is attached as by rivets or welding to a cleat 83 having a horizontal flange 94 secured to the top of bar 90 by screws 85. Plate 82 is of angular form to present a lower wall face 92a in a plane'substantially tangent to the front of platen 22, and an upper face 82b iiaring upwardly and rearwardly. The lower margin of the lower face 82"I may flare toward the platen as at 82". A plate 86 fastened by screws 81 upon bar 80 includes a block 88 drilled for a pintle 88 at one end of a transverse square axle bar |00 having also an opposite pintle I0| journaled in an ear |02 bent downwardly from a plate secured by screw 8| upon bar 88. A forwardly and upwardly flaring plate 04 has a lower margin |05 secured by screws |06, Figure 2, to the back of bar |00 together with the upper margin of a plate |81 which'is preferably of transparent plastic material. Plate |81 faces and is normally close to the lower work-sheet-backing face 82a to form with the latter a sheet-inserting throat or passage that is substantially tangent to the platen and for which there is a flaring entrance formed by plate |84 and the upper back plate portion 82h. A finger piece |08, fixed to pintle |0|, is'manipulatable for turning bar |88 and its plates |84, |81 to the Figure 8 position so that the throat flares at the bottom in order to facilitate introduction of a rear-inserted sheet through the throat. An extension of finger piece |09 has a slot 0 whose ends may stop on a pin in ear |02 to limit'the rotation of bar |00 and its plates |04, |81. A spring I2 surrounds pintle |0| and is compressed between ear' |82 and the pintle shoulder to urge bar |00 rightwardly of Figure 14 to keep a detent spot ||3 which is embossed on the inner side of finger piece |09 in one or another detent recess in ear |02, whereby bar and its plates |84, |01 are yieldably detented in either position,

In the present instance, the lower portion 92H| of the sheet backing plate 8'2 has a jog II4, Figure 7, to clear a head which includes the punching and sensing mechanism for. the perforations 85. The transparent front plate |01 endsat |01 to clear a front plate ||6 of the punching and sensing head. Plate ||6 and a rear Aplate such as |68, Figure 7, of said head are slightly separated facewise and are disposed on the carriage so that the work sheet 2| is introduced between them at the introduction of said work sheet bevplate 96.

tween plates 92, |01. The punching and sensing head, with its plate structure ||6, |60, is mounted on and movable with the carriage, but is arrestable so as to be stationary during punching and sensing, substantially as set forth in my copending application Serial No. 102,389, filed September 24, 1936, which matured as Patent No. 2,278,- 118 March 31, 1942, While the sheet backing plate 92 has the aforesaid jog ||4 to clear a backing plate, such as |60, of the head, the front plate |04, |01 also has a jog defined by the rightward extension of the upper margin of said front plate beyond the end |01 of its lower portion |01, as will be seen at Figure 7. The throat thus extends over the head to facilitate introduction of the work sheet between plates ||6, |60 of the head.

Bar 90 has a recess ||1, Figure 9, for a block |8 provided with lateral lugs; I9 seatable against the back of the front wall of channel bar 90. Said wall |20 and lugs I9 are drilled and tapped to .receive fastening screws |2| whereby block |8 is attached to bar 90 and projects above the latter. A pin |22, Figures 3, 4 and 10, adapted to engage in the -sheet locating hole 86 of the work sheet 2| has a sliding bearing in a hole |23 of block ||8. A reduced stem |24 of pin |22 has a sliding bearing in a. platel |25 xed by screws |26 to the back of bar 90. A spring |21 around stem |24 keeps pin |22 projecting normally from block ||8 as in Figures '4 and 11. A block-like arm |28 has a hole and is slitted above the hole for securing it to stem |24 by a screw |29. A corner of the block-like arm |28 is formed camming stud |3i on plate |25 and thereby limits the extent to which pin |22 normally projects from block ||8 under the urge of spring |21. A sleeve |32 may loosely surround pin |22 to cover spring |21, By rocking arm |28 in the direction of the arrow, Figure 3, its cam bevel overrides the end of stud |3| and thereby the pin |22 is rotated and moved longitudinally to retract its end from the sheet locating hole 86 and into block ||8 whereby to release the work sheet at y with a cam bevel |30 which normally abuts a operation of the line spacer vas will appear'l presently.

A sheet holding finger |34 is pivoted, at an ear |35 thereof, on a headed shoulder stud |36 on Saidl finger is provided with a boss |31 that faces block ||8 and is drilled to t around the sheet locating pin |22. A spring |38.

connected between plate 96 and finger |34 forces the latter and its boss |31 toward block 96 so away from the pin. 'I'he work sheet, when thus l stripped off pin |22, may be drawn upwardly out of the machine. Finger |34 has a forwardly flaring lateral extension |39 to facilitate the introduction of the worksheet to the machine. For s'uch introduction, the right-hand margin of the worksheet is placed behind extension |39 .and partly down into the above-described throat.

Then by drawing the corner of the sheet above the finger |34 forwardly, the nger is swungL forward enough to permit the right margin of the work sheet to pass behind boss |31, suitably beveled as at |33, Figure 11, and in front of pin |22 and stop laterally against a gazing ear |40 provided on plate 92. The sheet is pushed downwardly into the machine until its lowermost sheet locating hole 86 ilnds the locating pin |22, which condition may be readily sensed by the operator in that it will be felt that the edge of the hole 86 strikes the upper side of the projecting pin |22, and spring-pressed iinger |34 presses the sheet home over the projecting pin |22 and against the front face of block ||6.

Before a work sheet 2| is inserted in the machine and placed over pin |22, the feed'rolls 12, and apron 8|, may be cast oif, by depressing release lever 11, to facilitate the front insertion and squaring of the sheet. -When the front insertion of the work sheet is stopped by means of the last-made hole 86 and pin |22, it isrotatable about said pin |22, as is indicated by the dct-and-dash and full-line showing of the sheet in Figure '1, to place finally its right-side ed e against a stop |42 in order to place the wo sheet squarely in the machine. The feed rolls 12, and apron 8|, are now restored by restoring lever 11 to clamp the sheet, by means of the feed rolls, in its properly placed and squared position against platen 22 The gaging ear |46 may be slightly to the right of the normal position of the edge of the sheet 2| in order to facilitate turning of the sheet about pin |22,

Stop |42 projects forwardly from a bar |43, Figures 5 and '1, having slots |44 by which it is slidably mounted for-4 lateral movement on shoulder screws |45 threaded into a plate |46; said bar |43 is spaced by an intermediate plate |41 and |55 of plate |41 to determine the work sheet" ure 7 and may be described Vbriefly as follows:

-One side of a current supply -S is connected.

through a leadA I 53, closed switch |49. |56, and a lead |59 to a contact plate,|60 disposed behind the work sheet 2|. Each sensing element 33 may establish electrical contact of a lead i 6| with said plate |60 through a correspondingone. of the codal perforations 65 in the work sheet. A flexible or sliding contact connection |62 is associated with each lead |6| and enables the carriage, while traversing a sensing zone, to connect said lead |6 to a lead |63l running to a corresponding relay magnet, not shown, in a box |64 on the frame of themachine.. From the relay magnets in box |64, there is a common return lead |66 to the other side of the current supply S. A group` of numeral-type-operating magnets |61 is connected by a commonlead' |66 to one side of the current supply S. The other side of the current supply is connected by a lead |59 to a relay contact device, not shown, in the boxl94. The relay contact device is controlled by the relay magnets to connect st id other side 4of the current supply by way of lead |69, to one or another of the type operating magnets |61 to control operation of the Y latter. Excepting the switch |49, |50, the described circuit is along the lines shown in my aforesaid copending application Serial No. 102,- 389 which matured as Patent No. 2,278,118 March 31, 1942. In the diagram at Figure 7, only two of the leads |6| and their connections to the relay box are shown to illustrate that two of the perforations 85 are beingsensed in combination, by two of the sensing elements 88, for the instant digit. A lead and connection |62 is associated with each of the other sensing elements 88. It

will be apparent now that the operating circuit is partly completed at the switch |49, |50 if a work sheet is properly in place and that said circuit is fully completed by means of the sensing elements working through the perforations 85 of the work sheet. Conversely, if the contacts |49, |50 are separated, as would be the case in the absence or improper placement of a work sheet in the machine, the circuit would be broken so that even if the sensing elements 88 close their portions of the circuit, this cannot effect operation of the relay and electromagnetic devices.

Figure 7 shows an old balance o f 2263.19 as being typed to begin the third line of entry in response to the sensing of the last-made line of perforations 85 on the sheet. As hereinbefore mentioned, a line of entry concludes with typing the new balance in the balance column and making corresponding perforations 95 in the last column. A new sheet-locating hole 83 will also have been punched by operating the punch 81. The carriage is then returned either manually by means of the line-space and carriage-return handle 5|, or by power by causing the carriagereturn pinion 34 to become clutched to the power shaft 35. In either case there will occur an operation of the line space mechanism to advance the work sheet so that it is necessary rst to retract the sheet-locating pin |22, and this may be done by rotating the block-like arm |28 in the direction of the arrow, Figure 3. For rotating said arm |28 automatically at a line-spacing operation, the following structure may be provided.

The lower part of arm |28 is reduced in thickness as will be seen in Figures 3 and 4 and has a slot |10 to straddle a pin |1| ina transverse link |12. Headed shoulder studs |13 projecting from the rear side of supporting bar 90 are received in slots |14 in link |12 to support the latter slidably for opposite endwise movements. The line-space pawl-carrying bar 54 has an ear |15 to which there is attached, by a headed shoulder stud |16, a bar |11 having a slot |18 at which the rear end of said bar slidably ts a headed stud |19 in the left-hand plate 24 of the platen frame. A spacer |80 is disposed between plate 24 and bar |11. A horizontalplate |11EL of bar |11 is out out to form a cam edge |8| adjacent and cooperative with a downwardly projecting tongue |92 provvided on link |12. A spring |33 is anchored at |84 on supporting bar 90v and is attached to link |12 to urge the latter endwise toward the right of Figures 3 and 10. At the line-spacing operation an initial portion of the rearward stroke of line space pawl bar 54 is taken up before the pawl-controlling tab' 59, which is set in position for two line space units, permits the pawl 55 to Amay pass idly over stud |3| as a I behind plate |25 l 5 drive the line-space ratchet wheel 56 and platen 22 in line-spacing direction. During said initial portion of the rearward stroke of bar 54, the accompanying rearward movement of cam edgel I8| forces the link |12 to move leftwardly to rock arm |28 sufficiently so that its cam bevel |30 overrides the stud I3I, thereby causing said arm |23 as it rotates to shift rearwardly. Since said arm is secured to sheet-locating pin |22, the rearward shift of said arm which accompanies its described rocking movement retracts said pin sufciently from the worksheet to permit the linespace advance of the sheet which attends the completion of the rearward stroke of bar 54. During the completion of the rearward stroke of bar 54, the cam edge |8| may continue to move link |12 and correspondingly rock the arm 28 farther. During this'excess rocking of arm |23, the front dat face of the upper portion thereof dwellpand therefore need cause no further retraction of pin |22.

Upon finishing the carriage-return movement, the initiation of which follows the line-spacmg operation, the line-space and carriage-return handle 6|, or the carriage-return rack 33 is released thereby permitting the line-space pawl bar 54 to be restored forwardly by its spring 10. The accompanying forward restoration of the cam edge |8| permits link |12 to be restored rightwardly by its spring |83 thereby rotating arm |28 back to its normal position to permit sheet-locating pin |22 to be restored by its spring l|21 to its normal position in which it slightly projects from block I8. When pin |22 becomes thus restored the work sheet will have been line spaced and may present an unperforated portion opposite said pin so that there is then no obstruction by pin |22 to pulling the work sheet out of the machine. Nor will the restoration of pin |22 tend to pierce the unperforated portion, this being avoided because of the yieldability of finger |34.

Link |12 may have an upwardly projecting iinger piece |85 by which the link may be moved manually toward the left to retract pin |22 independently of a line-spacing or vcarriage-return operation. In such case the lower tongue |82 of link |12 moves idly within the opening of plate Link |12 is bent as at |81 merely to pass while the main portion of the lmksi disposed adjacent the back of supporting The front end of the sheet locating pin |22, Figures 11, 12, is shaped to leave a leading end of reduced area preferably in the form of a facet |89, and to recede bevelwise from the sides of the reduced end or facet as at and from the bottom of the end or facet as at |9I. The reduction of the front end of pin |22 and the bevel thus provided conduces to guide the edge of the lastmade hole 83 of the work sheet onto the pin when the sheet is inserted downwardly into the machine. 'I'he bevel, particularly the lower portion |9| thereof, also facilitates stripping the sheet oif the-pin. That is to say, while the sheet is being pulled forwardly by the typists hand to strip it off the pin, it may, at the same time be urged upwardly by a slight pull on the sheet so that the lower edge of the sheet locating hole 86 may react against the bevel |9| and this conduces to camming or guiding the sheet off the pin.

In Figure 10, |92 represents a pin in the lefthand side plate 24 to support the left end of link 12 against rearward thrust induced by the action of the cam |8|.

Platen axle 23 has the usual nger knobs |93. A conventional platen release clutch is enclosed in a casing |94 and is operable by means of a finger knob |95 to disconnect platen 22 from the spring-detented ratchet wheel 56 for permitting the platen to be rotated independently to bring the rst entry line of a ledger sheet to the printing line. A spring-pressed detent |96 is associated with wheel 56. A platen release clutch is exemplified in W. F. Helmond Patent No. 1,432,695, dated October 1'1, 1922.

Following the making of an entry, the work sheet 2|' may be pulled out of the machine after the carriage has been fully returned and the feed roll release lever 11 has been depressed to cast of! the feed rolls 12 to release the sheet. The operator may also depress the release lever 11, and eiIect the withdrawal of the work sheet from the machine at least in part during the power-driven return movement of the carriage thereby saving time as contrasted with waiting until the end of the carriage return to withdraw the sheet. The operator may depress the release lever 11 with the heel of the right hand and at the same time grasp the upper right-hand` corner of the sheet with the ngers to strip it oiI pin |22 and withdraw it from the machine. The feed rolls may be restored by restoring the release lever 11 when a succeeding sheet has been placed in the machine.

Block |l8 includes a die hole |91 for the locating-hole punch 81.' A guide and stripper bar |98 ,f

for punch 81 is fixed to the wall |20 of bar 90 together with a spacer |99 which provides for a work-sheet-receiving gap 200 between block ||8 and`bar |98. The front end of punch 61 is slidably supported in a ange 20| of plate 96 to which there is also iixed a retractor spring 202 articulated to punch 81. V

It will be observed that the punch, sensing and sheet locating devices are disposed, as represented ln Figures 7 and 14, to the right of the righthand end of the platen 22 and between said platen end and the right-hand side o t carriage frame 26. The inserted work sheet 2| accordingly extends laterally beyond the right platen end to the stop |42. Said stop |42 is preferably disposed, Figure 1, below the printing line and, therefore, may engage the sheet edge at the portion of the sheet which follows the curve of the platen. Therefore, stop |42 is spaced sufficiently distant from pin |22 to afford gaging points sufllciently separated in the direction of the sheet edge for facilitating squaring the sheet properly in the machine.

It has been stated above that usually the sheet is removed from the machine after making a single line of entry thereon. However, several lines may be entered upon the sheet before removing it; but a sheet-locating hole 86 is made on the sheet at least for the last line of entry so that if the sheet is thereafter removed, it may be relocated by means of pin |22 for the next entry made when the sheet is reinserted. When several lines of entry are made upon a sheet following insertion thereof in the machine, the line space mechanism of course is operated to line-space the entries and it will be obvious that the described operative connection of the linespace mechanism to the sheet-locating pin |22 serves to retract the latter to permit line spacing of the several entries made before the sheet is withdrawn. It may be that the sheet is not punched at 86 for an intermediate line of entry; in this event the sheet locating pin |22 may merely bear idly against the back of the sheet when the latter is positioned for the intermediate line of entry. Y

Variations may be resorted to within the scope of the invention and portions of the improyements may be used without others.

What is claimed is:

1. In a typing machine, the combination of a revoluble platen, a part operable in a working stroke of which a latter portion eiects rotation of the platen and attendant .advance of a work sheet on the platen, an initial portion of said stroke being idle a sheet locating stop, engaging and locating the sheet upon its insertion and normally opposing advance of the sheet, and means coacting with said part in its said initial idle portion of stroke to disengage said sheet and stop to permit advance of said sheet consonantly with the latter portion of said stroke.

2. In a typing machine the combination of a reciprocatory carriage in which a worksheet is insertable, a sheet locating stop on said carriage eiIective upon insertion of the sheet to ensage' a suitable edge of the sheet and normally opposing withdrawal of the inserted sheet, means operable for imparting an extensive movement tothe carriage, and means operatively connected to said carriage moving means so that an operation of said carriage moving means disengages -said sheet and stop to permit withdrawal of the sheet during the carriage movement.

3. In a typing machine, the combination of a reciprocatory carriage in which a work sheet is insertable, a sheet locating stop engaging said sheet upon its insertion and normally opposing withdrawal of the inserted sheet, a member on the carriage engageable to impart extensive movement to the carriage, said member, upon its engagement, being. initially and vlimitedly moved-relatively to the carriage before\the carriage movement is imparted, and means coacting with said member during its said initial movement to disengage said stop and'work sheet to permit withdrawal of said sheet during the subsequent carriage movement.

4. In a typing machine, a support, a worksheet locating pin, a device eective upon rotating the pin about its longitudinal axis in said support to retract the pin from the worksheet, a line space mechanism and an operating connection to said pin from said line space mechanism so that operation of said line space mechanism rotates and therefore retracts said pin.l

5. In a typing machine, a support, a work-sheet locating pin, a device effective upon rotating the pin about its longitudinal axis in said support to .retract the pin from the work sheet, a link connected to said pin and movable endwise to rotate and thereby retract the pin, and a cam movable transversely of and engaging the link to move it endwise.

6. In a typing machine, a support, a work-sheet locating pin, a device eiective upon rotating' the pin about its longitudinal axis in said support to retract the pin from the work-sheet, a link connected to said pin and 4movable endwise to rotate and thereby retract the pin, and a cam movable transversely of and engaging the link to move it endwise, said link having a finger piece and being movable endwise independently et said cam by means of said nger piece.

7. In a machine of the class described; a work sheet locating d'evice, comprising, a support.4 a

sheet-locating pin rotatably and longitudinally movable in said support. means operable to rotate said pin, and means elective, depending upon the rotation of said pin, to translate said rotation into longitudinal pin movement to project or retract said pin to or from the work sheet.

8. In a machine of the class described; a work sheet locating device, comprising, a support, a sheet-locating pin rotatably and longitudinally movable in said support, means operable to rotate said pin, and cam-and-spring means eiective depending on the rotation and direction of rotation of\said pin to translate said rotation into longitudinal pin movement to project or retract said pinto or from a work sheet.

9. In a. machine of the character described having a platen, a platen support and recording mechanism; work-sheet positioning means comprising a, single pin on said support adapted to t a locating hole or the like at one of the side edges of the sheet, and a stop on the platen support spaced from said pin in a direction following said edge and adapted to abut the paper, said pin and stop constituting the sole elements for positioning said sheet squarely to receive a record imprint from said recording mechanism.

10. In a machine of the character described having a platen, a platen support and recording mechanism; work-sheet positioning means comprising a single pin on said support adapted to t a locating hole or the like at one of the side edges of the sheet, a stop on the platen support spaced from said pin to engage said one edge, an abutment on the platen support againstwhich said stop is pressed when there is a squarely positioned sheet in the machine, and away from which the stop tends to move when there is not a squarely positioned sheet in the machine, said machine including an operating mechanism, and means responsive to the movement of the stop away from the abutment to suppress said operating mechanism.

11. In a machine of the character described having a platen, a platen support and recording mechanism; work-sheet positioning means comprising a single pin on said support adapted to fit a locating hole orthe like at one of the side edges of the sheet, a stop on the platen support spaced from said pin to engage said one edge, an abutment on the platen support against which said stop is pressed when there is a squarely positioned sheet in the machine, and away from which the stop tends to move when there is not a squarely positioned sheet in the machine, said machine including an electric operating circuit, and means responsive to movement of the stop away from the abutment to disable said circuit.

12. A cylindrical sheet-locating pin having an end face formed by a substantially quadrilaterally-edged facet, and by face portions receding bevel-wise from three edges of the facet, the fourth edge of the facet coinciding with the periphery of the pin.

13. A machine of the character described, having in combination a. front-strike revoluble platen, a platen frame, a sensing head or the like on and toward one side of said frame, including plate like structure extending beyond one end of the platen to overlap a marginal portion of the work sheet on the platen and extending laterally beyond said platen and above the printing line, and front and rear plates supported on said frame to lconstitute therebetween a front insertion throat extending laterally, along the platen, from said plate like structure of the head toward the other platen end and serving to introduce the sheet both to said structure and platen.

14. A machine of the character described, having in combination a front-strike revoluble platen, a platen frame, a 4sensing head or the like on and toward one side of said frame, including plate like structure extending beyond one end of the platen to overlap a marginal portion of the work sheet on the platen extending laterally beyond said platen and above the printing line, and front and rear plates supported on said frame to constitute therebetween a. front insertion throat extending laterally, along the platen, from said plate like structure of the head toward the other platen end and serving to introduce the sheet both to said structure and platen, said throat plates being jogged'at one lower comer portion so that upper margins thereof above the jog are disposed as a throat portion over said plate structure.

, 15. A machine of the character described, having in combination a front-strike revoluble platen, a platen frame, a sensing head or the like on and toward one side of said frame, including plate like structure extending beyond one end of the platen to overlap a marginalportion of the work sheet on the platen extending laterally beyond said platen and above the printing line. and frontand rear plates supported on said frame to constitute therebetween a front insertion throat extendinglaterally, along the platen, from said plate like structure of the head toward the other platen end and serving to introduce the sheet both to said structure and platen, said' throat pla-tes being :logged at one lower corner portion so that upper margins thereof above the jog are disposed as a throat portion over said plate structure, and a sheet locating-pin-device disposed on the platen frame at a level between said plate structure of the head and throat portion to cooperate with a, pin-engaging side portion of the sheet.

16. In a. front strike typing machine having a revolvable platen and a support therefor; front and rear structures mounted on said support and alfording opposite face portions which form a front sheet-insertion throat along the platen, a sheet-locating pin mounted to project across said throat from the rear structure to the front structure, the front structure being in two parts, lone of said parts being opposite said pin and being movably mounted relatively to the other of` said parts so as to be retractable from the pin to facilitate the placing and withdrawal of a locating hole, in a sheet introduced into the throat, over and from said pin.

' RICHARD W. PITMAN. 

